Click to expand Tap to zoom 40A21H-SB Type A Plate Sprocket for #40 Roller Chain - 21 Tooth - 5/8" Stock Bore Sale $19.33 SKU 40A21H-SB Quantity One - $19.33 Price Each on 2 to 4 - $17.40 Price Each on 5 or More - $15.46 Quantity Discounts Quantity One Price Each on 2 to 4 Price Each on 5 or More 1 2 3 4 5 6 7 8 9 10+ Quantity Quantity Add to cart 40A21H - SB (5/8)" Bore Heat Treated Type A PLATE Sprocket for #40 Roller Chain 21 Tooth Outside Diameter = 3.62" Pitch Diameter = 3.355" Free shipping in the USA!